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The Calculate rule lets you combine items into one package, and calculate the shipping cost based on the weight of the package.
Calculated shipping uses eBay's shipping calculator. Buyers enter their ZIP Codes and the shipping cost is calculated according to the buyers' location.
The Calculate rule charges buyers the shipping price for the item with the highest shipping weight. You can then add (or subtract) an additional weight for each item purchased from you.
Add combined shipping discounts to your listing and eBay automatically calculates the shipping discount when the buyer checks out. You add combined shipping discounts to your listings in the Sell Your Item form.
Profiles let you expand your calculated shipping discount rule to fit your needs. You can now specify the shipping cost for each additional item, and the items do not need to be the same type of item.